This sounds like classic stool withholding behavior triggered by potty-training stress/anxiety, which is very common around age 2–3 years. The child likely had a negative association (fear of potty/toilet, pain, pressure), and is now intentionally withholding stools, which can quickly worsen into constipation and make the fear cycle stronger.
Next Steps
Stop active potty training temporarily (2–6 weeks):
Remove pressure completely. Allow stooling in diaper if needed—this is not a setback, it is treatment.
Prevent constipation aggressively:
If stools are hard/infrequent, start a stool softener (commonly PEG 3350/macrogol) as per pediatrician guidance. Goal = soft daily stool. Painful stools reinforce fear.
Return to “no-pressure” routine:
Sit on potty/toilet 5 minutes after meals (gastrocolic reflex)
Feet supported on stool/footrest
No forcing, no prolonged sitting
Positive reinforcement only:
Sticker chart, praise for trying/sitting, not only for pooping.
Normalize and validate:
Tell parents: “He is not being stubborn—he is anxious/scared.”
Diet & hydration:
Increase water, fruits (pear/prune/papaya), vegetables, fiber.
Red flags needing evaluation:
3–4 days no stool
Abdominal pain/distension, vomiting
Blood in stool/fissure
Weight loss or poor growth
Reassurance: Most children improve well with patience + stool softening + removing pressure. Avoid punishment or repeated reminders.